Bonding aluminium to fiderglass

Any suggestion for bonding aluminium extursion, to fiberglass? Anodized light fitting to the cabin top. Not much load on it apart from it's own weight and it also will support the 3mm thick PVC foam hood lining on the middle, that is bugger all. I was thinking to use MS, or just epoxy with 404 compound. The thing is would be great if it could be removable in case if it needed.